package com.star.excel;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.util.*;

public class ExcelUtil {
    public static void main(String[] args) throws IOException {
        ExcelUtil excelUtil = new ExcelUtil();
        //读取excel数据
        List<List<String>> result = excelUtil.readExcelToObj("C:\\Users\\lmh\\Desktop\\aaa\\组合 1.xlsx");

        // 写数据到excel
        String pathName = "C:\\Users\\lmh\\Desktop\\aaa\\excel写数据.xls";
        excelUtil.writeExcel(pathName, result);
    }

    private void writeExcel(String pathName, List<List<String>> result) {
        //创建一个工作簿 即excel文件,再在该文件中创建一个sheet
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("汇总");
        HSSFRow row0 = sheet.createRow(0);
        row0.createCell(1).setCellValue("出口口岸");
        row0.createCell(2).setCellValue("出口日期");
        row0.createCell(3).setCellValue("AAA");

        for (int i = 0; i < result.size(); i++) {
            List<String> list = result.get(i);

            //在sheet中创建一行
            HSSFRow row = sheet.createRow(i + 1);

            //在该行写入各种类型的数据
            row.createCell(0).setCellValue("Table" + (i * 2 + 2 + 1));
            for (int j = 0; j < list.size(); j++) {
                String value = list.get(j);
                if (j <= 1) {
                    value = value.split("\n")[1];
                }
                row.createCell(j + 1).setCellValue(value);
            }
        }

        //最后写回磁盘
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(pathName);
            wb.write(out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 读取excel数据
     *
     * @param path
     */
    private List<List<String>> readExcelToObj(String path) {
        Workbook wb = null;
        List<List<String>> lists = new ArrayList<>();
        try {
            wb = WorkbookFactory.create(new File(path));
            for (int i = 0; i < 150 - 2; i += 2) {
                List<String> line1 = readExcel1(wb, i + 2, 0);
                List<String> line10 = readExcel10(wb, i + 2, 9);
                line1.addAll(line10);
                lists.add(line1);
            }

        } catch (InvalidFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return lists;
    }

    /**
     * 读取excel文件
     *
     * @param wb
     * @param sheetIndex    sheet页下标：从0开始
     * @param startReadLine 开始读取的行:从0开始
     * @param tailLine      去除最后读取的行
     */
    private ArrayList<Map<String, String>> readExcel(Workbook wb, int sheetIndex, int startReadLine, int tailLine) {
        Sheet sheet = wb.getSheetAt(sheetIndex);
        Row row = null;
        ArrayList<Map<String, String>> result = new ArrayList<Map<String, String>>();
        for (int i = startReadLine; i < sheet.getLastRowNum() - tailLine + 1; i++) {

            row = sheet.getRow(i);
            Map<String, String> map = new HashMap<String, String>();
            for (Cell c : row) {
                String returnStr = "";
                boolean isMerge = isMergedRegion(sheet, i, c.getColumnIndex());
                //判断是否具有合并单元格
                if (isMerge) {
                    String rs = getMergedRegionValue(sheet, row.getRowNum(), c.getColumnIndex());
//                    System.out.print(rs + "------ ");
                    returnStr = rs;
                } else {
//                    System.out.print(c.getRichStringCellValue()+"++++ ");
                    returnStr = c.getRichStringCellValue().getString();
                }
                if (c.getColumnIndex() == 0) {
                    map.put("id", returnStr);
                } else if (c.getColumnIndex() == 1) {
                    map.put("base", returnStr);
                } else if (c.getColumnIndex() == 2) {
                    map.put("siteName", returnStr);
                } else if (c.getColumnIndex() == 3) {
                    map.put("articleName", returnStr);
                } else if (c.getColumnIndex() == 4) {
                    map.put("mediaName", returnStr);
                } else if (c.getColumnIndex() == 5) {
                    map.put("mediaUrl", returnStr);
                } else if (c.getColumnIndex() == 6) {
                    map.put("newsSource", returnStr);
                } else if (c.getColumnIndex() == 7) {
                    map.put("isRecord", returnStr);
                } else if (c.getColumnIndex() == 8) {
                    map.put("recordTime", returnStr);
                } else if (c.getColumnIndex() == 9) {
                    map.put("remark", returnStr);
                }
            }
            result.add(map);
        }
        return result;
    }


    /**
     * 读取excel文件 第一行
     *
     * @param wb
     * @param sheetIndex    sheet页下标：从0开始
     * @param startReadLine 开始读取的行:从0开始
     */
    private List<String> readExcel1(Workbook wb, int sheetIndex, int startReadLine) {

        Sheet sheet = wb.getSheetAt(sheetIndex);
        Row row = null;
        row = sheet.getRow(startReadLine);

        List<String> list = new ArrayList<>();
        Cell c = row.getCell(0);
        list.add(getReturnStr(startReadLine, sheet, row, c));
        c = row.getCell(6);
        list.add(getReturnStr(startReadLine, sheet, row, c));
        return list;
    }

    private String getReturnStr(int startReadLine, Sheet sheet, Row row, Cell c) {
        String returnStr = "";
        boolean isMerge = isMergedRegion(sheet, startReadLine, c.getColumnIndex());
        //判断是否具有合并单元格
        if (isMerge) {
            String rs = getMergedRegionValue(sheet, row.getRowNum(), c.getColumnIndex());
//                    System.out.print(rs + "------ ");
            returnStr = rs;
        } else {
//                    System.out.print(c.getRichStringCellValue()+"++++ ");
            returnStr = c.getRichStringCellValue().getString();
        }
        return returnStr;
    }


    /**
     * 读取excel文件
     *
     * @param wb            10行
     * @param sheetIndex    sheet页下标：从0开始
     * @param startReadLine 开始读取的行:从0开始
     */
    private List<String> readExcel10(Workbook wb, int sheetIndex, int startReadLine) {
        Sheet sheet = wb.getSheetAt(sheetIndex);
        List<String> result = new ArrayList<>();
        Row row = sheet.getRow(startReadLine);
        Cell c = row.getCell(0);
        String returnStr = "";
        boolean isMerge = isMergedRegion(sheet, sheetIndex, c.getColumnIndex());
        //判断是否具有合并单元格
        if (isMerge) {
            String rs = getMergedRegionValue(sheet, row.getRowNum(), c.getColumnIndex());
//                    System.out.print(rs + "------ ");
            returnStr = rs;
        } else {
//                    System.out.print(c.getRichStringCellValue()+"++++ ");
            returnStr = c.getRichStringCellValue().getString();
        }

        result.add(returnStr);

        return result;
    }


    /**
     * 获取合并单元格的值
     *
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    public String getMergedRegionValue(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress ca = sheet.getMergedRegion(i);
            int firstColumn = ca.getFirstColumn();
            int lastColumn = ca.getLastColumn();
            int firstRow = ca.getFirstRow();
            int lastRow = ca.getLastRow();
            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    Row fRow = sheet.getRow(firstRow);
                    Cell fCell = fRow.getCell(firstColumn);
                    return getCellValue(fCell);
                }
            }
        }
        return null;
    }

    /**
     * 判断合并了行
     *
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    private boolean isMergedRow(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if (row == firstRow && row == lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断指定的单元格是否是合并单元格
     *
     * @param sheet
     * @param row    行下标
     * @param column 列下标
     * @return
     */
    private boolean isMergedRegion(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断sheet页中是否含有合并单元格
     *
     * @param sheet
     * @return
     */
    private boolean hasMerged(Sheet sheet) {
        return sheet.getNumMergedRegions() > 0 ? true : false;
    }

    /**
     * 合并单元格
     *
     * @param sheet
     * @param firstRow 开始行
     * @param lastRow  结束行
     * @param firstCol 开始列
     * @param lastCol  结束列
     */
    private void mergeRegion(Sheet sheet, int firstRow, int lastRow, int firstCol, int lastCol) {
        sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol));
    }

    /**
     * 获取单元格的值
     *
     * @param cell
     * @return
     */
    public String getCellValue(Cell cell) {

        if (cell == null) return "";

        if (cell.getCellType() == Cell.CELL_TYPE_STRING) {

            return cell.getStringCellValue();

        } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {

            return String.valueOf(cell.getBooleanCellValue());

        } else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {

            return cell.getCellFormula();

        } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {

            return String.valueOf(cell.getNumericCellValue());

        }
        return "";
    }

    /**
     * 从excel读取内容
     */
    public static void readContent(String fileName) {
        boolean isE2007 = false;    //判断是否是excel2007格式
        if (fileName.endsWith("xlsx"))
            isE2007 = true;
        try {
            InputStream input = new FileInputStream(fileName);  //建立输入流
            Workbook wb = null;
            //根据文件格式(2003或者2007)来初始化
            if (isE2007)
                wb = new XSSFWorkbook(input);
            else
                wb = new HSSFWorkbook(input);
            Sheet sheet = wb.getSheetAt(0);     //获得第一个表单
            Iterator<Row> rows = sheet.rowIterator(); //获得第一个表单的迭代器
            while (rows.hasNext()) {
                Row row = rows.next();  //获得行数据
                System.out.println("Row #" + row.getRowNum());  //获得行号从0开始
                Iterator<Cell> cells = row.cellIterator();    //获得第一行的迭代器
                while (cells.hasNext()) {
                    Cell cell = cells.next();
                    System.out.println("Cell #" + cell.getColumnIndex());
                    switch (cell.getCellType()) {   //根据cell中的类型来输出数据
                        case HSSFCell.CELL_TYPE_NUMERIC:
                            System.out.println(cell.getNumericCellValue());
                            break;
                        case HSSFCell.CELL_TYPE_STRING:
                            System.out.println(cell.getStringCellValue());
                            break;
                        case HSSFCell.CELL_TYPE_BOOLEAN:
                            System.out.println(cell.getBooleanCellValue());
                            break;
                        case HSSFCell.CELL_TYPE_FORMULA:
                            System.out.println(cell.getCellFormula());
                            break;
                        default:
                            System.out.println("unsuported sell type=======" + cell.getCellType());
                            break;
                    }
                }
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}